<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <TopHeader @addTodo="addTodo" />
      <List :todos="todos" :checkTodo="checkTodo" :deleteTodo="deleteTodo" />
      <FooterList
        :todos="todos"
        @checkAllTodo="checkAllTodo"
        @clearTodoDone="clearTodoDone"
      />
    </div>
  </div>
</template>

<script>
import FooterList from "./components/FooterList.vue";
import TopHeader from "./components/TopHeader.vue";
import List from "./components/List.vue";
export default {
  name: "App",
  data() {
    return {
      todos: JSON.parse(localStorage.getItem('todos')) || []
    };
  },
  //监视
  watch: {
    todos: {
      deep: true,
      handler(value) {
      window.localStorage.setItem("todos", JSON.stringify(value))
      }
    }
  },
  components: {
    FooterList,
    TopHeader,
    List,
  },
  methods: {
    //添加一个todo
    addTodo(todoObj) {
      console.log("我收到了数据");
      this.todos.unshift(todoObj);
    },
    //取消勾选一个todo
    checkTodo(id) {
      this.todos.forEach((todo) => {
        if (todo.id === id) {
          todo.done = !todo.done;
        }
      });
    },
    //删除
    deleteTodo(id) {
      this.todos = this.todos.filter((todo) => {
        return todo.id != id;
      });
    },
    //全选/取消全选
    checkAllTodo(done) {
      this.todos.forEach((todo) => {
        todo.done = done;
      });
    },
    //清除所有已经完成的任务
    clearTodoDone() {
      this.todos = this.todos.filter((todo) => {
        return !todo.done;
      });
    },
  },
};
</script>

<style>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>